1. Division of Endocrinology Diabetes and Metabolism, Department of Medicine, Indiana University School of Medicine, Indianapolis, IN 46202, USA
2. Mayo Clinic, Division of Endocrinology, Diabetes and Metabolism, Rochester, MN 55905, USA
3. Center for Health Services Research, Regenstrief Institute, Indianapolis, IN 46202, USA
4. Division of Gastroenterology and Hepatology, Department of Medicine, Indiana University School of Medicine, Indianapolis, IN 46202, USA
5. Richard L. Roudebush VA Medical Center, Indianapolis, IN 46202, USA